Akademik

вот так...!
ВОТ ТАК...! coll
[Particle; Invar; foll. by NP; fixed WO]
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used in exclamations to express the speaker's ironic, condescending, scornful etc attitude toward s.o. or sth., or to express his opinion that the person or thing in question does not deserve to be called by a certain name (as specified by the NP that follows):
- what a [NP]!;
- nice [NP]!;
- [NP], my foot!;
- some [NP] (one is)!;
- one calls himself a [NP]!
     ♦ "У вас, конечно, большой опыт. Я вас хотел спросить: по какому это признаку можно узнать, любишь человека или нет?" Вот так вопрос! Придётся отвечать (Грекова 1). "You've got great experience, and I want to ask you, what are the signs by which one can tell whether one does or doesn't love someone?" Nice question! I had to answer... (1b).
     ♦ Вот так садовод! Грушу от яблони отличить не может! Some gardener! He can't tell a pear tree from an apple tree!

Большой русско-английский фразеологический словарь. — М.: ACT-ПРЕСС КНИГА. . 2004.